Grease interceptor



May 4, 1948- E. w. N. BOOSEY GREASE I NTERCEPTOR Filed Aug. 4} 1945 INVENTOR. [01.4420 M/V Booszy BY ATTORNEY Patented May 4, 1948 "UNI ESTATES PATENT ()FFICE 2,440,793 Git-EASE 'INTERCEPTUR Edward W. N. Bo'osey, DetroityMikzh. mplication-august 4, 1945,.sefia1No. 608,819

eclaims.

This invention-relates teereese interceptorsthe object being to provide a nwarid imprcveastrueture wherein the water containing oil and grease discharging thereinto is caused 'to *s'eparate the oil and greases "from the water "and Water on'l'y i can be discharged through' thefoii'tlet into the sewer with which it is connected.

These and other features Sandobjects of the invention are hereinafter more fully described and claimed and the preierred form of grease' interceptor. einbodying my invention is shown in the accompanying drawing in which:

Fig. 1 is 'a perspective view of my improved 'grease interceptor.

taken on line 2--2 ofFig'. 1.

Fig. 3 is avrtioal section of the outlet column.

In its preferred form the interceptor rectangular in cross section and plan view and has at one end of the body and therewithin a vertical conduit I preferably ofrectangularrorm in cross section and having'an inlet "2 for connec tion with the conduit positioned intermediate the ends thereof. The wall 3 -o; the conduit 1 "op posite the inlet 2 is inwardly inclined in respect to the vertical and its lower end extends to a point forward of the adjacent side of the i h't'er c'eptor. Thus liquid containingoilsiand :greas'es tends to be deflected upwardly by the wall 2 to and through the'open upper end thereofprovid ing an opportunity for separation of the oils fand greases from the water discharging thei'ein'to from the inlet. This arrangement enablesthe lighter elements in the wasteiiquid to rise to the top and discharge "therefrom through the extension 4 at the upper "end of the'inletcolur'nnt The heavier liquids passdowinwardly through the lower end '5 ofthe inlet member which ex tends inwardly and downwardly at an angle to the vertical. Water passes through the opening 5 at the lower end of the inlet and passes between theshield 1 and the adiaeent side of the interceptor body as shown in 2.

'At the same end of the bodyiis provided outlet column 9 in spaced relationwith the inlet I and thecolunin S has-anioutIet conduit in connected therewith adjacent thetop ah'd provides for discharge ofliquid 'fromthe body.

The body of the interceptor has an upwardly inclined wall H at one end and above and in spaced relation with the said wall I1 is a series of plates l2 vertically positioned in spaced parallel relation with theintiline'd wall 'at the bottom as shown in Fig. 1. The interceptor has a recessed removable cover 113 to perinit access to .zontal wall extending transversely and-inspection of the interior of the body. The recessed cover provides an air space at the top of the body. The outlet column 9 has an open greases into the inlet column it flows into the body between the shield 1 and the sideiwalladjacent the inlet column and the'oil and'greases may rise to the'surface of the water between the spaced plates 12. The 'shield prevents flow of liquid laterally across the bottom of the body from the inlet to the outlet column. I k

This column 9,.as shown in Fig. 3, is formed at its upper end with an upwardly extending tubular portion 14 open to the airspaceabovethe liquid body in the interceptor. The upper end or the outlet column is of greater area in cro'ss section than the main body portion thereof and has a vertical dividing wall 15 therein opposite the outlet ID of the outlet column 9 and a horiof the head o fth'e column as indicated at 16. The horizontal wall It has an opening ll to permit air to new from the air and gas space at the top of the interceptor body to the outlet. When the liquid level in the interceptor body rises a sufiilcient distance above the lower end of the outlet time I! liquid mayp'assthi'ough the opening I'I tot-he outlet. Also whena volume of air accumulates in the top of the body sufficient to lower the liq- "uid level in the interceptor bodybelowthe lower end of the vent tube l4, it may discharge through the outlet lll connected to thesewer Preferably the vent tube 1'4 extends downwardly into the "outlet conduit '9 to below the horizontal Waill l6 adjacent the top thereof, 7

By thearrangement of partsdescrib'ed asir'nple and efficient device is provided to separate the oils and greases from the inflowing body and k prevent discharge thereof to the "outlet.

It is believed evident from the foregoing that the various objects and features of the invention are obtained by the described relationship of parts. I f

Having thus briefly described my invention, its utility anemone of operation, "what I claim and desire to secure by Letters Patent of the United States is:

l. A grease interceptor comprising a charm b'ei-ed body of rectangular form in cross section and having a bottom wall provided atone end with a troughlike portion below the levei of the bottom wall, an inlet column at said --end of the body having an opening intermediate its'ends to receive an inlet conduit, the wall of the body opposite the inlet opening having an upwardly inclined portion at its lower end tending to deflect liquid upwardly thereby providing a time interval for greases to rise, the inlet column having an opening at its upper end to the interior of the body through which the lighter liquids in the upper end thereof may flow into the upper portion of the liquid in the body, the lower end of the inlet column having an opening at its bottom through which inflowing liquid is discharged across the bottom of the body, the wall of the body opposite the inlet end having an upwardly relation transversely of the body, and means associated'with the inlet column directing the flow of liquid discharging thereinto across the bottom of the body and to thereafter flow in the opposite direction to the outlet, a cover for the body forming an air chamber above the liquid level-in the body, and means for venting said chamber to the outlet to thereby prevent accumulationof pressure on the liquid in the body.

, 2. A' greaseinterceptor comprising a chambered bodyof rectangular form in cross section and having a bottom wall formed at one end to provide a troughlike portion below the level of the bottom wall and adjacent. to and parallel with a; vertical side wall, an inlet column within the body at said end having an outlet at its lower end through which liquid may discharge across the bottom'wall toward the opposite side wall ofthe body, said bottom wall having a portion thereof. upwardly inclined toward said opposite side wall, a series of vertically positioned and horizontally spaced plates having the lower ends in spaced relation with said upwardly inclined portion, said plates providing a means restricting the rapidity of flow of liquid across the bottom thereby providing a time interval permitting oil and grease in the inflowing liquid to rise between the-plates to the surface of the liquid in the interceptor body, and an outlet column positioned to permit liquid from the bottom of the body to discharge from the interceptor. 3. A grease interceptor comprising a chambered body of rectangular form in cross section and having a bottom wall formed at one end to provide a troughlike portion below the level of the bottom wall and adjacent to and parallel with a vertical side wall, an inlet column within the body at said end having an outlet at its lower end through which liquid may discharge across the bottom wall toward the opposite side wall of the body, said bottom wall having a portion thereof upwardly inclined toward said opposite side wall, a series of vertically positioned and horizontally spaced plates having the lower ends-in spaced re- 4 let column opening at its lower end to said troughlike portion below the bottom wall.

4. A grease interceptor comprising a chambered body of rectangular form in cross section and having a bottom wall formed at one end to provide a troughlike portion below the level of the bottom wall and adjacent to and parallel with a vertical side wall, an inlet-column within the body at said end having an outlet at its lower end through which liquid may discharge across the bottom wall toward the opposite side wall of the body, said bottom wall having a portion thereof upwardly inclined toward said opposite 7 side wall, a series of vertically positioned and horizontally spaced plates having the lower ends in spaced relation with said upwardly inclined portion, said plates providing a means restricting the rapidity of flow of liquid across the bottom thereby providing a time interval permitting oil and grease in the inflowing liquid to rise between the plates to the surface of the liquid in the interceptor body, an outlet column positioned to permit liquid from the bottom of the body to discharge from the interceptor, said outlet column including a means to vent the air space at the top of the liquid body to the outlet.

5. A grease interceptor comprising a chambered body of rectangular form in cross section and having a bottom wall formed at one end to provide a troughlike portion below the level of the bottom wall and adjacent to and parallel with a vertical side wall, aninlet column within the body at said end having an outlet at its lower end through which liquid may discharge across the bottom wall toward the opposite sidewall of the body, said bottom wall having a portion thereof upwardly inclined toward said opposite side wall, a series of vertically positioned and horizontally spaced plates having the lowerend in spaced relation with said upwardly inclined portion, said plates providing a means restricting the rapidity of flow of liquid across the bottom thereof providing a time interval permitting oil and grease in the inflowing liquid to rise between the plates to the surface of the liquid in'the interceptor body, an outlet column positioned to permit liquid from the bottom of the body to discharge from the interceptor, and means associated with the outlet column preventing accumulation of air in the top of the body thereby maintaining the liquid in the body under atmosbody, said bottom wall having a portion thereofupwardly inclined toward said oppositeside wall, a series of vertically positioned and horizontally spaced plates having the lower end in spaced rela tion with said upwardly inclined portion; said plates providing a means restricting the rapidity of flow of liquid across the bottom thereby providing a time interval permitting oil and grease in the inflowing liquid to rise between the plates to the surface of the liquid in the interceptor body, an outlet column positioned to permit liquid from the bottom'of the body to discharge from the interceptor, and means for preventing liquid discharging-into the body from the inlet column from passing laterally aros s' the bottom of the body to the outlet.

UNITED STATES PATENTS Number liame Date r I 1,760,229 Am i: May 27, 1930 EDWARD BOOSEY- 2,268,354 Boosey Jan. 6, 1942 2,3 ,6 ....A. ,14 REFERENCES CITED 83 43 Arndt 11g 28 9 5 FOREIGN PATENTS The following references are of record in the Number Country t file of this patent: 30, 42

Switzerland Mar. 17, 1919 

